Which best compares simple machines with compound machines?

Question:

Which best compares simple machines with compound machines?

(A)Both make work easier, but compound machines consist of two or more simple machines.

(B)Both make work easier, but compound machines have less mechanical advantage than simple machines.

(C)Both can reduce the force needed to do work, but simple machines are more common in everyday machines.

(D) Both always increase the force needed to do work, but compound machines are more common in everyday machines.

"Both of them makes work easier, perhaps the compound machine consists of two or more simple machines" compares the simple machine with the compound machine in best way.

Explanation:

Simple machine are mechanical devices like lever, pulley , wedge etc.,that is used to  apply force. Any machine made using the simple machines or the machines that comprises of 2 or more simple machines is referred as compound machine.

An example of compound machine is wheelbarrow  which is built up of a lever and axle and a wheel . As the 'compound machine' is consist of 2 or more simple machine, its has higher efficiency when compared to simple machines. If each of the six simple machine have higher distance force, compound machine can have higher force as it multiplies the efficiency of all the simple machines working all together.

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